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/**
* Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
*/
package org.eclipse.emf.cdo.internal.workspace;
import org.eclipse.emf.cdo.common.id.CDOID;
import org.eclipse.emf.cdo.common.id.CDOIDUtil;
import org.eclipse.emf.cdo.common.protocol.CDODataInput;
import org.eclipse.emf.cdo.common.protocol.CDODataOutput;
import org.eclipse.emf.cdo.common.revision.CDORevision;
import org.eclipse.emf.cdo.spi.common.revision.InternalCDORevision;
import org.eclipse.emf.cdo.spi.workspace.InternalCDOWorkspaceMemory;
import org.eclipse.net4j.util.factory.ProductCreationException;
import org.eclipse.net4j.util.io.ExtendedDataInputStream;
import org.eclipse.net4j.util.io.ExtendedDataOutputStream;
import org.eclipse.net4j.util.io.IOUtil;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.HashSet;
import java.util.Set;
/**
* @author Eike Stepper
*/
public class FolderCDOWorkspaceMemory extends AbstractCDOWorkspaceMemory
{
private File folder;
public FolderCDOWorkspaceMemory(File folder)
{
this.folder = folder;
}
public File getFolder()
{
return folder;
}
public void clear()
{
IOUtil.delete(folder);
checkExists(folder, false);
createFolder();
}
public Set<CDOID> getIDs()
{
Set<CDOID> ids = new HashSet<CDOID>();
for (String key : folder.list())
{
CDOID id = getCDOID(key);
ids.add(id);
}
return ids;
}
public CDORevision getRevision(CDOID id)
{
File file = getFile(id);
if (!file.exists() || file.length() == 0)
{
return null;
}
FileInputStream fis = null;
try
{
fis = new FileInputStream(file);
ExtendedDataInputStream edis = new ExtendedDataInputStream(fis);
CDODataInput in = createCDODataInput(edis);
return in.readCDORevision();
}
catch (Exception ex)
{
throw new IllegalStateException("Could not read from " + file.getAbsolutePath(), ex);
}
finally
{
IOUtil.close(fis);
}
}
@Override
protected void registerChangedOrDetachedObject(InternalCDORevision revision)
{
File file = getFile(revision.getID());
if (file.exists())
{
return;
}
FileOutputStream fos = null;
try
{
fos = new FileOutputStream(file);
ExtendedDataOutputStream edos = new ExtendedDataOutputStream(fos);
CDODataOutput out = createCDODataOutput(edos);
out.writeCDORevision(revision, CDORevision.UNCHUNKED);
edos.flush();
}
catch (Exception ex)
{
throw new IllegalStateException("Could not create " + file.getAbsolutePath(), ex);
}
finally
{
IOUtil.close(fos);
}
}
@Override
protected void registerAddedObject(CDOID id)
{
File file = getFile(id);
if (file.exists())
{
return;
}
FileOutputStream fos = null;
try
{
fos = new FileOutputStream(file); // Just create an empty marker file
}
catch (Exception ex)
{
throw new IllegalStateException("Could not create " + file.getAbsolutePath(), ex);
}
finally
{
IOUtil.close(fos);
}
}
@Override
protected void deregisterObject(CDOID id)
{
File file = getFile(id);
file.delete();
checkExists(file, false);
}
protected CDOID getCDOID(String filename)
{
return CDOIDUtil.read(filename);
}
protected String getKey(CDOID id)
{
StringBuilder builder = new StringBuilder();
CDOIDUtil.write(builder, id);
return builder.toString();
}
protected File getFile(CDOID id)
{
String key = getKey(id);
return new File(folder, key);
}
private void createFolder()
{
IOUtil.mkdirs(folder);
checkExists(folder, true);
}
private void checkExists(File file, boolean exists)
{
if (exists)
{
if (!file.exists())
{
throw new IllegalStateException("File does not exist: " + file.getAbsolutePath());
}
}
else
{
if (file.exists())
{
throw new IllegalStateException("File does still exist: " + file.getAbsolutePath());
}
}
}
/**
* @author Eike Stepper
*/
public static final class Factory extends org.eclipse.net4j.util.factory.Factory
{
public static final String TYPE = "folder";
public Factory()
{
super(InternalCDOWorkspaceMemory.PRODUCT_GROUP, TYPE);
}
public Factory(String productGroup, String type)
{
super(productGroup, type);
}
public FolderCDOWorkspaceMemory create(String description) throws ProductCreationException
{
return new FolderCDOWorkspaceMemory(new File(description));
}
}
}
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